What? Who? Where?
How on earth would I make a judgement call on which dimension "everyone" would find most important to make a "quite a bit" call on EITHER of them? That's why I say it's a trade-off: length can be deterring to some, while others don't like a "bulky wallet" while others might want a case on one device and not another, while others...
All I know is both are going to be much worse than using a gamepad to play, and both are going to be a lot more disconcerting to carry around than a GBA.